Ross Controls ROSS MODULAR I - Manual (Page 45)

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Expansion Power Unit
The RPSSSE24A expansion power unit passes 24VDC
field power to the I/O modules to the right of it. This unit
extends the backplane bus power and creates a new field
voltage partition segment for driving field devices for up
to 13 I/O modules. The expansion power unit separates
field power from I/O modules to the left of the unit,
effectively providing functional and logical partitioning for:
• Separating field power between input and output
modules
• Separating field power to the analog and digital
modules
• Grouping modules to perform a specific task or
function
You can use multiple expansion power units with any of
the communication adapters to assemble a full system. If
you are using the RPSSCDM12A adapter, you may use
a RPSSSE24A expansion power unit to add additional
modules. For example, if you had a 36 module system
with a RPSSCDM12A adapter, you would have at least
two or more RPSSSE24A expansion power units to
provide more PointBus current for modules to the right of
the supply.
• 24VDC to 5VDC converter
• 1.3A, 5VDC output (extend backplane power)
• Starts new voltage distribution
• Partitioning
Power Distribution General Specifications
RPSSSE24A
Power Supply Requirements
Note: In order to comply with CE Low Voltage Directives (LVD), you must use a Safety Extra
Low Voltage (SELV) or a Protected Extra Low Voltage (PELV) power supply to power this
adapter
Field Side Power Requirements 24VDC (+20% = 28.8VDC max.) @ 400 mA
Inrush Current, Max. 6 A for 10 ms
Input Overvoltage Protection Reverse polarity protected
Power Supply Interruption Protection
Output voltage will stay within specifications when input drops out for 10 ms at 10V with max.
load
Power Supply Input Voltage, Nom. 24VDC
Operating Voltage Range 10…28.8VDC
Power Consumption, Max. 9.8 W @ 28.8VDC
Power Dissipation, Max. 3.0 W @ 28.8VDC
Thermal Dissipation, Max. 10.0 BTU/hr @ 28.8VDC
Isolation Voltage 1250V rms
Field Power Bus Supply Voltage, Nom. 12VDC or 24VDC
Field Power Bus Supply Current, Max. 10 A
RPSSSE24A Current Derating for Mounting
1.3
1.0
0.5
Current
Voltage
10 19.2
Horizontal - 1 A @ (10-19.2V); 1.3 A @ (19.2-28.8V)
Vertical - 1 A @ (10-28.8V)
28.8
Serial Bus System